Improvement in writing-tablets



C. N. BROWN.

Writing-Tablets. N0. 144,950. Patented Nov.25,1873.

Fig. 7.

WITfiEssEs. m. w m 4% AM H1070 -z ITHMMPIl/L CaMX/osao/me's mums) UNITEDSTATES PATENT OFFICE.

CHAR-LES N. 'BBOVBN, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN WRITING-TABLETS.

Specification formingpart of Letters Patent No. 144,950, dated Noveml or25, 1873; application filed October 3, 1873.

To all whom it may concern:

Be it known that I, O. N. BROWN, of Providence, in the county ofProvidence and in the State of Rhode Island, have invented certain newand useful Improvements in Writing-Tablets; and dohereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawin gs and to the letters of referencemarked thereon, making a part of this specification.

The nature of my invention consists in ribs raised or otherwise formedon or attached to the leaves of an erasible tablet for the purpose ofobviating the erasure of the writing by rubbing or friction of writtensurfaces, as will be hereinafter more fully set forth.

' In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure 1 is a view of an ordinary erasible tablet embodying myinvention, and Fig. 2 is a longitudinal section through one of theleaves of the same.

A A represent the leaves of an erasible tablet riveted together at oneend in the usual manner, so that the leaves may be spread In tabletsmade of ivory the ribs B B may I be attached to the leaves in anysuitable manner, or depressions cut out to lezwe the ribs raised on thesurface.

Tablets made of thick paper, pasteboard, or

other similar material, may be rolled between corrugated rollers orstamped between pressblocks, so as to form the raised ribs on thesurface of the leaves.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

An erasive tablet provided with the ribs B B, raised on or attached tothe leaves thereof, substantially as and for the purposes herein setforth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 16th day of September, 1873.

CHARLES N. BROWN. [L. s.]

Witnesses:

CHARLES SELDEN, JOHN G. PURKIS.

